{"schema":"threatline.record/2","record":{"id":"CVE-2026-92289","aliases":[],"summary":"Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in \"PKCE or secret\" mode because checkEndPointAuthenticationCredentials does not verify the client secret","details":"Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in \"PKCE or secret\" mode because checkEndPointAuthenticationCredentials does not verify the client secret.\n\nWith oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint issues a code even when the request carries no code_challenge, and token() admits the exchange as long as a challenge was stored or an authentication method was returned for the caller. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the method deduced from the request, so any Basic or form credential satisfies the secret branch. validatePKCEChallenge() then passes, because neither a challenge nor a verifier is present.\n\nAn attacker who intercepts an authorization code issued to a public Relying Party can exchange it for the user's access, ID and refresh tokens by replaying the client_id with an arbitrary secret, which is the attack PKCE prevents. Dynamic client registration creates every Relying Party in this mode.","categories":["Unclassified"],"product":"","vendor":"","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-92289","source_modified_at":"2026-09-26T22:29:08.052Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":null,"vendor":null,"versions":[{"lessThan":"2.23.4","status":"affected","version":"2.23.0","versionType":"custom"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-92289","source_modified_at":"2026-09-26T22:29:08.052Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":null,"ecosystem":null},"version":"2.23.4","basis":"first unaffected version stated in the CVE record"}],"cvss":9.1,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00393,"percentile":0.32234,"score_date":"2026-10-23"},"published_at":"2026-09-25T00:15:49.826Z","modified_at":"2026-09-26T22:29:08.052Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-92289","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-26T22:29:08.052Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-92289","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719","tags":["exploit"]},{"source":"CVE List","url":"https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.23.4","tags":["release-notes"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"poc","automatable":"yes","technical_impact":"total","assessed_at":"2026-09-25T15:38:54.575555Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-26T22:29:08.052Z","content_hash":"919fe0ea029735cff0e779f4fa3efec1e29553911bddeafdc45a887de403252e"}}